Log skidding carriage

B - Operations – Transporting – 61 – B

Patent

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Details

198/12.02

B61B 7/00 (2006.01) B66C 21/00 (2006.01)

Patent

CA 2011110

Abstract A fail-safe log skidding carriage for skyline logging operations utilizes parallel clamp assemblies for engagement of the skyline or dragline in a repeating alternating sequence. The outer ends of a pivoted crank are operably connected to the movable shoes of the two clamp assemblies to move them between operative and released clamping conditions. The crank is moved over-center with respect to a reference line perpendicular to the lines of contact between the crank and the clamp assemblies and intersecting the pivot axis of the crank, thereby preventing accidental mechanical release of a locked crank assembly should hydraulic failure occur during use of the carriage. The hydraulic system is remotely controlled through a radio receiver that sequences the hydraulic cylinder from one extreme position to the other. An overriding electrical control is provided to assure clamping of the dragline when a log or logs are lifted to the carriage.

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